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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "n900accelerometer.h"
#include "../util/util.h"
#include <QFile>
#include <QDebug>
#include <stdio.h>
char const * const n900accelerometer::id("n900.accelerometer");
char const * const n900accelerometer::filename("/sys/class/i2c-adapter/i2c-3/3-001d/coord");
char const * const n900accelerometer::range("/sys/class/i2c-adapter/i2c-3/3-001d/scale");
char const * const n900accelerometer::rate("/sys/class/i2c-adapter/i2c-3/3-001d/rate");
extern bool portraitOrientation;
n900accelerometer::n900accelerometer(QSensor *sensor)
: n900filebasedsensor(sensor)
{
setReading<QAccelerometerReading>(&m_reading);
// According to the kernel driver, this runs at 100 or 400Hz
// but we can't change the rate because we don't run as root.
// The hardware seems to run at 100Hz by default so report that.
// Report 1-100Hz so the app can poll less frequently if it wants to.
addDataRate(1, 100);
// According to the kernel driver this reports +- 2G or +- 8G (with lower accuracy)
// but we can't change the range because we don't run as root.
// The hardware seems to run at +- 2G by default so report that.
addOutputRange(-22.418, 22.418, 0.17651); // 2G
setDescription(QLatin1String("lis302dl"));
}
void n900accelerometer::start()
{
if (!QFile::exists(QLatin1String(filename)))
goto error;
n900filebasedsensor::start();
return;
error:
sensorStopped();
}
void n900accelerometer::poll()
{
// Note that this is a rather inefficient way to generate this data.
// Ideally the kernel would scale the hardware's values to m/s^2 for us
// and give us a timestamp along with that data.
FILE *fd = fopen(filename, "r");
if (!fd) return;
int x, y, z;
int rs = fscanf(fd, "%i %i %i", &x, &y, &z);
fclose(fd);
if (rs != 3) return;
// Convert from milli-Gs to meters per second per second
// Using 1 G = 9.80665 m/s^2
qreal ax = x * 0.00980665;
qreal ay = y * -0.00980665;
qreal az = z * -0.00980665;
m_reading.setTimestamp(getTimestamp());
if (portraitOrientation) {
m_reading.setX(ay);
m_reading.setY(-ax);
} else {
m_reading.setX(ax);
m_reading.setY(ay);
}
m_reading.setZ(az);
newReadingAvailable();
}
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